Device and method for fixing soft tissue

ABSTRACT

A device for fixing soft tissue. A sleeve is detachably connected to a self-drilling tapping screw, moving and rotating the self-drilling tapping screw. A guide bar is detachably connected to the self-drilling tapping screw and fit in the sleeve. A fixing pin is fit in a washer and connected to the self-drilling tapping screw. The guide bar is detachably fit in the fixing pin. The fixing pin abuts the washer and the self-drilling tapping screw.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a device and method for fixing soft tissue, andmore particularly to a device and method for affixing glenoidal labrumto a shoulder joint.

2. Description of the Related Art

A shoulder joint is mainly composed of a ball-like humeral head and aglenoidal cup of scapula, tightly covered by various fibered connectivetissues and muscles, performing flexion, extension, adduction,abduction, rotation and circumduction. Moreover, a glenoidal labrum isformed on the edge of the glenoidal cup of the shoulder joint,increasing the surface area of the glenoidal cup, enhancing stability ofthe shoulder joint, and providing attachment for ligaments.

Operating frequently, the shoulder joint is easily injured ordislocated. Soft tissue, such as ligaments, tendons and cartilage, ofthe shoulder joint is easily separated therefrom due to sport injury,overuse, or improper posture. Injury to the shoulder joint oftenincludes tearing of tendons of rotator cuff muscles, SLAP (SuperiorLesion, Anterior to Posterior, wherein the upper part of the glenoidallabrum is pulled off the glenoidal cup by tendons of biceps of humerus),and Bankart lesion (the lower part of the glenoidal labrum is separatedfrom the glenoidal cup by dislocation of the humerus and drag of theligament).

The soft tissue of the shoulder joint requires surgical interventionwhen seriously separated therefrom, such intervention comprising openand arthroscopic techniques. In both cases, suturing directly orindirectly secures the torn or separated soft tissue to the bones of theshoulder joint. For example, torn rotator cuff tendons are attached tothe humerus or separated glenoidal labrum to glenoidal cup of theshoulder joint by such suturing.

In a direct fixation method, the soft tissue is directly sutured tobones with drilled holes. Specifically, the soft tissue is fixed to thebones by seaming the sutures between the soft tissue and the holes. Thisdirect fixation method, however, is very time consuming and requires ahigh degree of surgical precision. Moreover, the sutures are easilybroken, adversely affecting reconstruction and regeneration of the softtissue.

In an indirect fixation method, the soft tissue is fixed to bones bysoft tissue anchors. Specifically, the soft tissue anchors are disposedin the bones and the soft tissue is then fixed to both the soft tissueanchors and bones by sutures. There are two types of conventional softtissue anchor, push-in and turn-in. The push-in soft tissue anchor maycomprise ridges, barbs, or extending wings or fingers. When employed,the push-in anchor is inserted into the bones and the ridges, barbs, orextending wings or fingers thereof engage the bones, as disclosed as asuture anchor with annular ridges in U.S. Pat. No. 5,100,417, a harpoonsuture anchor with barbs in U.S. Pat. No. 5,141,520, an umbrella-shapedsuture anchor device with outwardly extending wing members in U.S. Pat.No. 5,545,180, and a knotless suture anchor with extended fingers inU.S. Pat. No. 6,692,516. The turn-in soft tissue anchor may comprise atip and threads. When employed, the tip and threads thereof are insertedinto the bones, as disclosed in U.S. Pat. Nos. 4,632,100, 5,156,616,5,851,219, and 6,117,162.

Accordingly, conventional soft tissue anchors require sutures to passthrough eyelets or apertures thereof and to be knotted to secure thesoft tissue to bones, complicating surgery. Moreover, when conventionalsoft tissue anchors are employed in arthroscopic surgery, such forfixing SLAP, operation thereof is very difficult due to limited space.Thus, attaching the separated glenoidal labrum to the glenoidal cup ofthe shoulder joint by the conventional soft tissue anchors is difficultand time-consuming.

BRIEF SUMMARY OF THE INVENTION

A detailed description is given in the following embodiments withreference to the accompanying drawings.

A device for fixing soft tissue is disclosed, comprising a self-drillingtapping screw, a sleeve, a guide bar, a washer, and a fixing pin. Thesleeve is detachably connected to the self-drilling tapping screw,moving and rotating the self-drilling tapping screw. The guide bar isdetachably connected to the self-drilling tapping screw and fit in thesleeve. The fixing pin is fit in the washer and connected to theself-drilling tapping screw. The guide bar is detachably fit in thefixing pin. The fixing pin abuts the washer and the self-drillingtapping screw.

The self-drilling tapping screw comprises a main body and a firstthreaded portion formed on the outer surface thereof.

The self-drilling tapping screw further comprises a first connectingportion connected to the main body. The sleeve comprises a secondconnecting portion detachably connected to the first connecting portion.

The first and second connecting portions are complementary.

The self-drilling tapping screw further comprises a central hole formedin the main body. The guide bar is detachably disposed in the centralhole.

The central hole comprises a second threaded portion. The guide barcomprises a third threaded portion engaging the second threaded portion.

The self-drilling tapping screw further comprises a central hole formedin the main body. The fixing pin is disposed in the central hole.

The central hole comprises at least one first engaging portion. Thefixing pin comprises at least one second engaging portion engaging thefirst engaging portion.

The first and second engaging portions are complementary.

The central hole comprises a fourth threaded portion. The fixing pincomprises a fifth threaded portion engaging the fourth threaded portion.

The sleeve comprises a first central through hole in which the guide baris detachably fit.

The device further comprises an anti-slip screw detachably fit in thesleeve and movably protruding into the first central through hole,abutting and fixing the guide bar.

The washer comprises at least one protruding splinter formed on thecircumference thereof.

The washer further comprises a second central through hole in which thefixing pin is fit.

The fixing pin further comprises a third central through hole in whichthe guide bar is detachably fit.

The fixing pin further comprises a retardant portion abutting thewasher.

The self-drilling tapping screw, washer, and fixing pin comprisetitanium alloy, stainless steel, or biocompatible material.

The washer and fixing pin comprise bio-absorbable macromolecularmaterial.

The washer and fixing pin comprise poly lactide-glycolic acid (PLGA).

A method for fixing soft tissue is disclosed. The method comprisesproviding a self-drilling tapping screw, connecting a guide bar to theself-drilling tapping screw, fitting a sleeve on the guide bar andmoving the sleeve along the guide bar to connect with the self-drillingtapping screw, moving and rotating the sleeve, enabling theself-drilling tapping screw connected thereto to sequentially penetratethe soft tissue and a compact bone and enter a cancellous bone,separating the sleeve from the self-drilling tapping screw and removingthe sleeve from the compact bone and soft tissue, fitting a washer onthe guide bar and moving the washer along the guide bar to the softtissue, fitting a fixing pin on the guide bar and moving the fixing pininto the self-drilling tapping screw along the guide bar and through thesoft tissue and compact bone, wherein the fixing pin is engaged in theself-drilling tapping screw and abuts the washer and the self-drillingtapping screw, tightly attaching the soft tissue to the compact bone,and separating the guide bar from the self-drilling tapping screw andremoving the guide bar from the compact bone and soft tissue.

The method further comprises detachably fitting an anti-slip screw inthe sleeve to abut and fix the guide bar.

The method further comprises forcing the washer into the soft tissue,tightly attaching the soft tissue to the compact bone.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be more fully understood by reading the subsequentdetailed description and examples with references made to theaccompanying drawings, wherein:

FIG. 1 is a schematic exploded view of a device for fixing soft tissueof a first embodiment of the invention;

FIG. 2 is a schematic plane view of a self-drilling tapping screw of thedevice for fixing soft tissue of the first embodiment of the invention;

FIG. 3 is a schematic plane view of a guide bar of the device for fixingsoft tissue of the first embodiment of the invention;

FIG. 4 is a schematic plane view of a sleeve of the device for fixingsoft tissue of the first embodiment of the invention;

FIG. 5 is a schematic plane view of a washer of the device for fixingsoft tissue of the first embodiment of the invention;

FIG. 6 is a schematic plane view of a fixing pin of the device forfixing soft tissue of the first embodiment of the invention;

FIG. 7A is a schematic view showing operation of the device for fixingsoft tissue of the first embodiment of the invention;

FIG. 7B is another schematic view showing operation of the device forfixing soft tissue of the first embodiment of the invention;

FIG. 7C is yet another schematic view showing operation of the devicefor fixing soft tissue of the first embodiment of the invention;

FIG. 7D is still another schematic view showing operation of the devicefor fixing soft tissue of the first embodiment of the invention;

FIG. 8 is a flowchart showing a method for fixing soft tissue of thefirst embodiment of the invention;

FIG. 9 is a schematic exploded view of a device for fixing soft tissueof a second embodiment of the invention;

FIG. 10 is a schematic plane view of a self-drilling tapping screw ofthe device for fixing soft tissue of the second embodiment of theinvention;

FIG. 11 is a schematic plane view of a fixing pin of the device forfixing soft tissue of the second embodiment of the invention;

FIG. 12 is a schematic view showing operation of the device for fixingsoft tissue of the second embodiment of the invention;

FIG. 13 is a schematic exploded view of a device for fixing soft tissueof a third embodiment of the invention;

FIG. 14A is a schematic view showing operation of the device for fixingsoft tissue of the third embodiment of the invention;

FIG. 14B is another schematic view showing operation of the device forfixing soft tissue of the third embodiment of the invention;

FIG. 14C is yet another schematic view showing operation of the devicefor fixing soft tissue of the third embodiment of the invention; and

FIG. 15 is a flowchart showing a method for fixing soft tissue of thethird embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

The following description is of the best-contemplated mode of carryingout the invention. This description is made for the purpose ofillustrating the general principles of the invention and should not betaken in a limiting sense. The scope of the invention is best determinedby reference to the appended claims.

First Embodiment

Referring to FIG. 1, a device 100 for fixing soft tissue comprise aself-drilling tapping screw 110, a sleeve 120, a guide bar 130, a washer140, a fixing pin 150, and an anti-slip screw 160.

Referring to FIG. 2, the self-drilling tapping screw 110 comprises amain body 111, a first connecting portion 112, and a central hole 113.The main body 111 comprises a first threaded portion 111 a formed on theouter surface thereof. In this embodiment, the first threaded portion111 a is configured with outer threads. The first connecting portion 112is connected to the main body 111. The central hole 113 is formed in themain body 111 and comprises a second threaded portion 113 a and aplurality of first engaging portions 113 b. In this embodiment, thesecond threaded portion 113 a is configured with inner threads, and theself-drilling tapping screw 110 may comprise titanium alloy, stainlesssteel, or biocompatible material.

Referring to FIG. 3, the guide bar 130 comprises a third threadedportion 131. In this embodiment, the third threaded portion 131 isconfigured with outer threads.

Referring to FIG. 4, the sleeve 120 comprises a second connectingportion 121 and a first central through hole 122. Specifically, thefirst connecting portion 112 of the self-drilling tapping screw 110 iscomplementary to the second connecting portion 121 of the sleeve 120.For example, the first connecting portion 112 may be configured with aninner octagonal profile and the second connecting portion 121 with anouter octagonal profile.

Referring to FIG. 5, the washer 140 comprises a plurality of protrudingsplinters 141 and a second central through hole 142. The protrudingsplinters 141 are formed on the circumference of the washer 140.

Referring to FIG. 6, the fixing pin 150 comprises a plurality of secondengaging portions 151, a third central through hole 152, and a retardantportion 153. Specifically, the second engaging portions 151 correspondto and are complementary to the first engaging portions 113 b of thecentral hole 113 in the self-drilling tapping screw 110, respectively.Moreover, the washer 140 and fixing pin 150 may comprise bio-absorbablemacromolecular material, such as poly lactide-glycolic acid (PLGA).Additionally, the washer 140 may be integrally formed with the fixingpin 150.

As shown in FIG. 4, the anti-slip screw 160 is detachably fit in thesleeve 120. Specifically, the anti-slip screw 160 moves in the sleeve120 and protrudes into the first central through hole 122 of the sleeve120, abutting and fixing the guide bar 130 fit in the first centralthrough hole 122.

The following description is directed to a method for fixing soft tissueusing the aforementioned device 100. For example, a separated glenoidallabrum is fixed to a glenoidal cup of a shoulder joint.

As shown in FIG. 7A, the guide bar 130 is connected to the self-drillingtapping screw 110. Namely, the third threaded portion 131 of the guidebar 130 is engaged with the second threaded portion 113 a of the centralhole 113 in the self-drilling tapping screw 110. The sleeve 120 is thenfit on the guide bar 130 and slides to connect with the self-drillingtapping screw 110 along the guide bar 130. At this point, the guide bar130 is fit in the self-drilling tapping screw 110 and first centralthrough hole 122 of the sleeve 120, and the second connecting portion121 of the sleeve 120 engages the first connecting portion 112 of theself-drilling tapping screw 110. The anti-slip screw 160 is fit in thesleeve 120 to abut and fix the guide bar 130, preventing the guide bar130 from separating from the self-drilling tapping screw 110 ordeviating from the central axis of the sleeve 120. The sleeve 120 ismoved and rotated toward the glenoidal labrum (soft tissue) A and bonesB beneath the glenoidal cup by a simple tool, such as a hammer. As thesecond connecting portion 121 of the sleeve 120 engages the firstconnecting portion 112 of the self-drilling tapping screw 110, theself-drilling tapping screw 110 is moved and rotated and sequentiallypenetrates the glenoidal labrum A and a compact bone B1 of the bones B,thereby entering a cancellous bone B2 of the bones B. As this point, theself-drilling tapping screw 110 is tightly fixed in the cancellous boneB2 by the first threaded portion 111 a formed on the main body 111thereof.

As shown in FIG. 7B, after being loosened, the anti-slip screw 160 isseparated from the guide bar 130. The sleeve 120 is separated from theself-drilling tapping screw 110 and guide bar 130. Namely, the secondconnecting portion 121 of the sleeve 120 is separated from the firstconnecting portion 112 of the self-drilling tapping screw 110. Thesleeve 120 is then removed from the compact bone B1 and glenoidal labrumA.

As shown in FIG. 7C, the washer 140 is fit on the guide bar 130 andslides to the glenoidal labrum A along the guide bar 130.

As shown in FIG. 7C and FIG. 7D, the fixing pin 150 is fit on the guidebar 130 and moved into the self-drilling tapping screw 110 along theguide bar 130 and through the second central through hole 142 of thewasher 140, glenoidal labrum A, and compact bone B1. At this point, thesecond engaging portions 151 of the fixing pin 150 respectively engagethe first engaging portions 113 b of the central hole 113 in theself-drilling tapping screw 110, the guide bar 130 is fit in the thirdcentral through hole 152 of the fixing pin 150, and the retardantportion 153 of the fixing pin 150 abuts the washer 140. Accordingly, thefixing pin 150 abuts the washer 140 and the self-drilling tapping screw110, thereby attaching the glenoidal labrum A to the compact bone B1.

As shown in FIG. 7D, the guide bar 130 is separated from theself-drilling tapping screw 110. Namely, the third threaded portion 131of the guide bar 130 is disengaged from the second threaded portion 113a of the central hole 113 in the self-drilling tapping screw 110. Theguide bar 130 is then removed to the exterior of the glenoidal labrum A.The washer 140 is pushed into the glenoidal labrum A. At this point, theprotruding splinters 141 of the washer 140 are engaged with theglenoidal labrum A, such that the glenoidal labrum A is tightly attachedor fixed to the compact bone B1.

Additionally, the aforementioned method for fixing soft tissue using thedevice 100 is shown by steps S1 to S8 in FIG. 8.

Second Embodiment

Elements corresponding to those in the first embodiment share the samereference numerals.

Referring to FIG. 9, a device 100′ for fixing soft tissue comprise aself-drilling tapping screw 110′, a sleeve 120, a guide bar 130, awasher 140, a fixing pin 150′, and an anti-slip screw 160.

As shown in FIG. 10, the self-drilling tapping screw 110′ comprises amain body 111′, a first connecting portion 112, and a central hole 113′.The main body 111′ comprises a first threaded portion 111′a formed onthe outer surface thereof. In this embodiment, the first threadedportion 111′a is configured with outer threads. The first connectingportion 112 is connected to the main body 111′. The central hole 113′ isformed in the main body 111′ and comprises a second threaded portion113′a and a fourth threaded portion 113′b. In this embodiment, thesecond threaded portion 113 a and fourth threaded portion 113′b areconfigured with inner threads, and the self-drilling tapping screw 110′comprises titanium alloy, stainless steel, or biocompatible material.

As shown in FIG. 11, the fixing pin 150′ comprises a fifth threadedportion 151′, a third central through hole 152, and a retardant portion153. Specifically, the fifth threaded portion 151′ corresponds to thefourth threaded portion 113′b in the central hole 113′ of theself-drilling tapping screw 110′ and is configured with outer threads.

Moreover, the washer 140 and fixing pin 150′ may comprise titanium alloyor stainless steel. Similarly, the washer 140 may be integrally formedwith the fixing pin 150′.

Structure, disposition, and function of other elements in thisembodiment are the same as those in the first embodiment, andexplanation thereof is omitted for simplicity.

As the method for fixing soft tissue using the aforementioned device100′ is similar to that using the aforementioned device 100, thefollowing description is directed to the difference therebetween.

When a separated glenoidal labrum is fixed to a glenoidal cup of ashoulder joint by the device 100′, as shown in FIG. 12, the fixing pin150′ is fixed to the self-drilling tapping screw 110′. Namely, the fifththreaded portion 151′ of the fixing pin 150′ engages the fourth threadedportion 113′b in the central hole 113′ of the self-drilling tappingscrew 110′ and the retardant portion 153 thereof abuts the washer 140.Thus, the fixing pin 150′ abuts between the washer 140 and theself-drilling tapping screw 110′, attaching the glenoidal labrum A tothe compact bone B1.

Similarly, the guide bar 130 is separated from the self-drilling tappingscrew 110′. Namely, the third threaded portion 131 of the guide bar 130is disengaged from the second threaded portion 113′a of the central hole113′ in the self-drilling tapping screw 110′. The guide bar 130 is thenremoved to the exterior of the glenoidal labrum A. The washer 140 ispushed into the glenoidal labrum A. At this point, the protrudingsplinters 141 of the washer 140 are engaged with the glenoidal labrum A,such that the glenoidal labrum A is tightly attached or fixed to thecompact bone B1.

Third Embodiment

Referring to FIG. 13, a device 300 for fixing soft tissue comprises aself-drilling tapping screw 310, a fitting member 320, and a fixing pin330.

The self-drilling tapping screw 310 comprises a main body 311, a firsthollow abutting hole 312, and a second threaded portion 313. The mainbody 311 comprises a first threaded portion 311 a formed on the outersurface thereof. In this embodiment, the first threaded portion 311 a isconfigured with outer threads. The first hollow abutting hole 312 isformed in the main body 311. The second threaded portion 313 is formedin the main body 311 and connected to the first hollow abutting hole312. In this embodiment, the second threaded portion 313 is configuredwith inner threads, and the self-drilling tapping screw 310 may comprisetitanium alloy, stainless steel, or biocompatible material.

As shown in FIGS. 13, 14B, and 14C, the fitting member 320 is connectedto the self-drilling tapping screw 310 and comprises a protrudingabutting portion 321, a second hollow abutting portion 322, and aplurality protruding splinters 323. The protruding abutting portion 321abuts against the first hollow abutting hole 312 of the self-drillingtapping screw 310. The second hollow abutting portion 322 is formed inthe protruding abutting portion 321 and corresponds to the secondthreaded portion 313 of the self-drilling tapping screw 310. Theprotruding splinters 323 are formed on the circumference of the fittingmember 320 and surround the protruding abutting portion 321. Moreover,the fitting member 320 may comprise bio-absorbable macromolecularmaterial (such as poly lactide-glycolic acid (PLGA)) or engineeringplastic.

The fixing pin 330 fits in the fitting member 320 and self-drillingtapping screw 310 and is connected to the self-drilling tapping screw310. Specifically, the fixing pin 330 comprises a third threaded portion331 and a retardant portion 332 connected thereto. The third threadedportion 331 engages the second threaded portion 313 of the self-drillingtapping screw 310. The retardant portion 332 abuts against the secondhollow abutting portion 322 of the fitting member 320. Accordingly, whenfitting in the fitting member 320 and self-drilling tapping screw 310,the fixing pin 330 is abutted between the fitting member 320 and theself-drilling tapping screw 310. Moreover, the fixing pin 330 maycomprise titanium alloy, stainless steel, or biocompatible material.

The following description is directed to a method for fixing soft tissueusing the aforementioned device 300. For example, a separated glenoidallabrum is fixed to a glenoidal cup of a shoulder joint.

As shown in FIG. 14A, the self-drilling tapping screw 310 is moved androtated toward the glenoidal labrum (soft tissue) A and glenoidal cup(hard tissue) B by a tool, entering the glenoidal cup (hard tissue) Bthrough the glenoidal labrum (soft tissue) A. At this point, theself-drilling tapping screw 310 is tightly fixed in the glenoidal cup(hard tissue) B by means of the first threaded portion 311 a formed onthe main body 311 thereof.

As shown in FIG. 14B, the fitting member 320 is connected to theself-drilling tapping screw 310 through the glenoidal labrum (softtissue) A, such that the glenoidal labrum (soft tissue) A is between theself-drilling tapping screw 310 and the fitting member 320. Here, theprotruding abutting portion 321 of the fitting member 320 abuts againstthe first hollow abutting hole 312 of the self-drilling tapping screw310, and the protruding splinters 323 thereof are engaged with theglenoidal labrum (soft tissue) A.

As shown in FIG. 14C, the fixing pin 330 is fit in the fitting member320 and self-drilling tapping screw 310 and is, connected to theself-drilling tapping screw 310. Here, the fixing pin 330 is abuttedbetween the fitting member 320 and the self-drilling tapping screw 310.Namely, the third threaded portion 331 of the fixing pin 330 engages thesecond threaded portion 313 of the self-drilling tapping screw 310, andthe retardant portion 332 of the fixing pin 330 abuts against the secondhollow abutting portion 322 of the fitting member 320. Accordingly, theglenoidal labrum (soft tissue) A is tightly attached to the glenoidalcup (hard tissue) B.

Additionally, the aforementioned method for fixing soft tissue using thedevice 300 is shown by steps S1′ to S3′ in FIG. 15.

In conclusion, when the separated glenoidal labrum (soft tissue) isre-fixed to the glenoidal cup (hard tissue) of the shoulder joint by thedisclosed device and method, no suture is required, thus reducingsurgical complexity and time. Moreover, the disclosed device and methodprovide superior attachment or fixing of the glenoidal labrum (softtissue), facilitating reconstruction and regeneration thereof.

While the invention has been described by way of example and in terms ofpreferred embodiment, it is to be understood that the invention is notlimited thereto. To the contrary, it is intended to cover variousmodifications and similar arrangements (as would be apparent to thoseskilled in the art). Therefore, the scope of the appended claims shouldbe accorded the broadest interpretation so as to encompass all suchmodifications and similar arrangements.

1. A method for fixing soft tissue, comprising: providing aself-drilling tapping screw; connecting a guide bar to the self-drillingtapping screw; fitting a sleeve on the guide bar and moving the sleevealong the guide bar to connect to the self-drilling tapping screw;moving and rotating the sleeve, enabling the self-drilling tapping screwconnected thereto to sequentially penetrate the soft tissue and acompact bone and enter a cancellous bone, wherein the self-drillingtapping screw is fixed in the cancellous bone; separating the sleevefrom the self-drilling tapping screw and the guide bar, and removing thesleeve from the compact bone and soft tissue; fitting a washer on theguide bar and moving the washer along the guide bar to the soft tissue,wherein the washer comprises a second central through hole; fitting afixing pin on the guide bar and moving the fixing pin into theself-drilling tapping screw along the guide bar and through the softtissue and compact bone, wherein the fixing pin is fit in the secondcentral through hole of the washer and comprises a third central throughhole in which the guide bar is detachably fit, and the fixing pin isfixed in the self-drilling tapping screw and abuts the washer and theself-drilling tapping screw, tightly attaching the soft tissue to thecompact bone; and separating the guide bar from the self-drillingtapping screw and removing the guide bar from the compact bone and softtissue.
 2. The method as claimed in claim 1, further comprisingdetachably fitting an anti-slip screw in the sleeve to abut and fix theguide bar.
 3. The method as claimed in claim 1, further comprisingforcing the washer into the soft tissue, tightly attaching the softtissue to the compact bone.
 4. The method as claimed in claim 1, whereinthe self-drilling tapping screw comprises a main body, and a firstthreaded portion is formed on the outer surface thereof, engaging thecancellous bone.
 5. The method as claimed in claim 4, wherein theself-drilling tapping screw further comprises a first connecting portionconnected to the main body, and the sleeve comprises a second connectingportion detachably connected to the first connecting portion.
 6. Themethod as claimed in claim 5, wherein the first and second connectingportions are complementary.
 7. The method as claimed in claim 4, whereinthe self-drilling tapping screw further comprises a central hole formedin the main body, and the guide bar is detachably disposed in thecentral hole.
 8. The method as claimed in claim 7, wherein the centralhole comprises a second threaded portion, and the guide bar comprises athird threaded portion engaging the second threaded portion.
 9. Themethod as claimed in claim 4, wherein the self-drilling tapping screwfurther comprises a central hole formed in the main body, and the fixingpin is disposed in the central hole.
 10. The method as claimed in claim9, wherein the central hole comprises at least one first engagingportion, and the fixing pin comprises at least one second engagingportion engaging the first engaging portion.
 11. The method as claimedin claim 10, wherein the first and second engaging portions arecomplementary.
 12. The method as claimed in claim 9, wherein the centralhole comprises a fourth threaded portion, and the fixing pin comprises afifth threaded portion engaging the fourth threaded portion.
 13. Themethod as claimed in claim 2, wherein the sleeve comprises a firstcentral through hole in which the guide bar is detachably fit, and theanti-slip screw movably protrudes into the first central through hole,abutting and fixing the guide bar.
 14. The method as claimed in claim 3,wherein the washer comprises at least one protruding splinter formed onthe circumference thereof and engaged in the soft tissue.
 15. The methodas claimed in claim 1, wherein the fixing pin further comprises aretardant portion abutting the washer.
 16. The method as claimed inclaim 1, wherein the self-drilling tapping screw, washer, and fixing pincomprise titanium alloy, stainless steel, or biocompatible material. 17.The method as claimed in claim 1, wherein the washer and fixing pincomprise bio-absorbable macromolecular material.
 18. A method for fixingsoft tissue, comprising: forcing a self-drilling tapping screw to enterhard tissue through the soft tissue, wherein the self-drilling tappingscrew is fixed in the hard tissue and comprises a main body, a firstthreaded portion, and a first hollow abutting hole, the first threadedportion is formed on the outer surface of the main body and is engagedwith the hard tissue, and the first hollow abutting hole is formed inthe main body; connecting a fitting member to the self-drilling tappingscrew through the soft tissue such that the soft tissue is held betweenthe self-drilling tapping screw and the fitting member, wherein thefitting member comprises a protruding abutting portion abutting againstthe first hollow abutting hole of the self-drilling tapping screw, andat least one protruding splinter formed on the circumference thereof,surrounding the protruding abutting portion, and engaged with the softtissue; and fitting a fixing pin in the fitting member and self-drillingtapping screw and connecting the fixing pin to the self-drilling tappingscrew, wherein the fixing pin is abutted between the fitting member andthe self-drilling tapping screw, such that the soft tissue is tightlyattached to the hard tissue.
 19. The method as claimed in claim 18,wherein the self-drilling tapping screw further comprises a secondthreaded portion formed in the main body and connected to the firsthollow abutting hole, the fitting member further comprises a secondhollow abutting hole formed in the protruding abutting portion andcorresponding to the second threaded portion, the fixing pin comprises athird threaded portion and a retardant portion, the third threadedportion is connected to the retardant portion and engages the secondthreaded portion, and the retardant portion abuts against the secondhollow abutting hole.
 20. The method as claimed in claim 18, wherein theself-drilling tapping screw and fixing pin comprise titanium alloy,stainless steel, or biocompatible material, and the fitting membercomprises bio-absorbable macromolecular material.
 21. The method asclaimed in claim 18, wherein the fitting member comprises polylactide-glycolic acid (PLGA) or engineering plastic.